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  <title>Gamma-corrects an image</title>

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</div><hr /><div id="gmagick.gammaimage" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">Gmagick::gammaimage</h1>
  <p class="verinfo">(PECL gmagick &gt;= Unknown)</p><p class="refpurpose"><span class="refname">Gmagick::gammaimage</span> &mdash; <span class="dc-title">Gamma-corrects an image</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-gmagick.gammaimage-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type"><a href="class.gmagick.html" class="type Gmagick">Gmagick</a></span> <span class="methodname"><strong>Gmagick::gammaimage</strong></span>
    ( <span class="methodparam"><span class="type">float</span> <code class="parameter">$gamma</code></span>
   )</div>

  <p class="para rdfs-comment">
   Gamma-corrects an image. The same image viewed on different devices will have perceptual differences in the way the image&#039;s intensities are represented on the screen. Specify individual gamma levels for the red, green, and blue channels, or adjust all three with the gamma parameter. Values typically range from 0.8 to 2.3. 
  </p>

 </div>


 <div class="refsect1 parameters" id="refsect1-gmagick.gammaimage-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">gamma</code></em></dt>

     <dd>

      <p class="para">
       The amount of gamma-correction.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-gmagick.gammaimage-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
  The gamma corrected Gmagick object.
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-gmagick.gammaimage-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   错误时抛出
<strong class="classname">GmagickException</strong>。
  </p>
 </div>


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